About O’Hara’s Son Roofing Company Since 1987, O’Hara’s Son Roofing (OSR) has provided new commercial roof construction, commercial roof replacement, commercial leak repair service, and preventative maintenance for commercial roofs. Headquartered in Chicago, IL, our team of 100 employees is dedicated to providing quality work with a strong focus on safety and communication. As of 2026, OSR ranks among the Top 20 Roofing Contractors in the country. We specialize in the installation of numerous s…
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